2180781983 has 2 divisors, whose sum is σ = 2180781984. Its totient is φ = 2180781982.

The previous prime is 2180781973. The next prime is 2180781997. The reversal of 2180781983 is 3891870812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2180781983 - 2⁶ = 2180781919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180781973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090390991 + 1090390992.

It is an arithmetic number, because the mean of its divisors is an integer number (1090390992).

Almost surely, 2^2180781983 is an apocalyptic number.

2180781983 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180781983 is an equidigital number, since it uses as much as digits as its factorization.

2180781983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 2180781983 is about 46698.8434867503. The cubic root of 2180781983 is about 1296.7932765248.

The spelling of 2180781983 in words is "two billion, one hundred eighty million, seven hundred eighty-one thousand, nine hundred eighty-three".